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Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net sales $ 285,907 $ 279,317 $ 172,149
Cost of sales 235,388 232,133 160,053
Gross profit 50,519 47,184 12,096
Selling, general, and administrative expense 24,954 18,495 16,663
Gain on sale of facilities 0 0 (2,960)
Restructuring expense 0 0 1,364
Operating income (loss) 25,565 28,689 (2,971)
Bargain purchase gain 0 0 20,080
Other income 953 4,383 267
Interest income 49 40 267
Interest expense (933) (472) (583)
Income before income taxes 25,634 32,640 17,060
Income tax expense (benefit) 6,584 4,738 (3,252)
Net income $ 19,050 $ 27,902 $ 20,312
Net income per common share      
Basic (in dollars per share) $ 1.95 $ 2.86 $ 2.09
Diluted (in dollars per share) $ 1.93 $ 2.85 $ 2.09
Shares used in per share calculations:      
Basic (in shares) 9,788 9,741 9,726
Diluted (in shares) 9,873 9,779 9,733